uic: use QString::compare in toBool

As a potential improvement discovered while working on QTBUG-98434,
replace the current comparison in toBool with QString::compare.


Task-number: QTBUG-103100
Change-Id: If5482adeea1537d24a97a4dda2d27ecc3b12b5bf
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>

src/tools/uic/utils.h

@@ -12,7 +12,7 @@
 QT_BEGIN_NAMESPACE
 
 inline bool toBool(const QString &str)
-{ return str.toLower() == QLatin1StringView("true"); }
+{ return QString::compare(str, QLatin1StringView("true"), Qt::CaseInsensitive) == 0; }
 
 inline QString toString(const DomString *str)
 { return str ? str->text() : QString(); }